b'2848John Coburn/Copyright Agency, 202248 49JOHN COBURN (19252006) CHARLES BILLICH (b.1934),Curtain of the Sun - Sydney OperaConcentration,House, charcoal on paper,Colour screenprint, signed and dated 18/3/74, lower right,inscribed Artists Proof I/X, 60 x 48cmtitled and signed under image, $300500 50 x 75cm (overall)$1,5002,000'